Character generator

Details Character generator Character generator

1984-02-23

1987-03-03

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 314

Patent

active

046480692

ABSTRACT:
A character generator uses a first memory having a permanent resident area and an overlay area. A second memory stores patterns of all characters. The permanent resident area stores character patterns having the highest frequency of use. The overlay area is not permanent and stores a subset of character patterns known to have high frequency use, but of lesser frequency than in the permanent area. A directory is provided for accessing character patterns in the overlay area. Characters are accessed using character code points. Each character code point represented in the directory has a usage count field and an address pointer field for enabling the character to be chained in a logical sequence with the other characters in accordance with their respective frequencies of use. The directory is searched serially and the search time will be shorter for the characters having highest frequency of use. The characters are accessed in the directory by their code points. Since the permanent area does not change, no directory is needed for accessing the characters in it. When a character is not found in the first memory, it is accessed from the second memory (which may be disk) and is stored in the overlay area and is represented in the directory by overlaying an existing entry of lowest frequency, e.g. zero usage.

REFERENCES:
patent: 3936664 (1976-02-01), Sato
patent: 4031519 (1977-06-01), Findley
patent: 4131883 (1978-12-01), Lundstrom
patent: 4181973 (1980-01-01), Tseng

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